FWIW I'm using a power supply rated at 1A on my 50Gb (10+40) MkIIa and I've had no problems at all. Maybe the UK has a different type of Ampere... :-)

Steve.
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Mk2a 10+40Gb Darkstorm Neon Red Nakamichi CD45z, Genesis Five Channel, Genesis A16s, JL 8W6 x3